The formulation of the periodic system by the Russian Mendeleev was followed by the surprising discovery of gallium by the Frenchman de Boisbaudran. The Englishman Ramsay's explanation of an 'impurity' in air led to recognition of a new period. A young fellow countryman, Moseley, justified the expected existence of 92 elements. A German couple,…

Online collaborative argumentations need instructional support to ensure social interactions and in-depth cognitive engagement. It is known that graphic organizers assist in comprehending information and negotiating meanings for individual and collective tasks. This study intends to compare the effects of different graphic organizers in…

It is well-documented that multiracial college students experience microaggressions in their everyday schooling experiences. However, little research has gone on to place these individual experiences in the overall organizational structure of educational settings. Using a racial formation theoretical frame, we explore how institutions make use of…

Systematic errors are unfortunately common in analyses performed by students in teaching laboratories. Quality control (QC) tools are required to detect and solve bias in laboratory analyses. However, although QC has become routine in real-world laboratories, it is still rarely applied in teaching laboratories. For this reason, systematic errors…

The traditional instructional approach combined with standard textbook examples provide a disengaging learning environment for students in introductory statistics courses. This article proposes and examines an experiential music-based single-class-period learning activity for an introductory statistics course. This activity teaches students how to…

This is the fourth in a series of statistical articles for mathematics teachers. In this article, the authors discuss topics in General Mathematics in Unit 2 Topic 1 (Univariate data analysis and the statistical investigation process) and topics in Essential Mathematics, Unit 2 Topic 1 (Representing and comparing data).

Nautical charts are an essential information resource for safe navigation. However, they are not only a useful resource for navigators; According to the International Hydrological Organization (IHO), they essentially fulfill two functions: 1) Maritime navigation, since most hydrographic services have the obligation to provide coverage of the…

Although teachers at many colleges and universities receive regular performance reviews (e.g. annual reviews), there are no absolute standards regarding what teaching performance in terms of teaching evaluation ratings during the review period is satisfactory. To address this issue, in this paper we propose a new two-step approach to construct…

In this article, James presents the Extended Hundreds Chart, a task he used with Year 6 students to explore their thinking about and representations of negative numbers.

Using the layout described here (which could be photocopied or handwritten), students can see how the periodic table was first envisaged after finding similarities in the properties of common elements. Then, with more discoveries some gaps were filled and, when additional elements did not fit, new groups had to be included.

In case of that human civilization was viewed as an integrated organism, the Periodic Table of the Civilizations (PTOC in short) has been formulated and recommended based on the development level and periodicity of core elements of human civilization. It divides the frontier process of the human civilization from the birth of humankind to the end…

Nomographs (or nomograms, or alignment charts) are graphical representations of mathematical relationships (extending to empirical relationships of data) which are used by simply applying a straightedge across the plot through points on scales representing independent variables, which then crosses the corresponding datum point for the dependent…

Introduction: Cervical cancer incidence and mortality is higher among Latinas compared with non-Hispanic White women and barriers to screening include lack of knowledge, lack of access to health care, and cultural factors. Both video and printed material have been found effective as health education tools in underserved populations. The purpose of…

Rules charts are commonplace on classroom walls throughout the world. This article examines how such charts work to sustain discursive power relationships among teachers and students by mobilising idealised notions of the student within the classroom. The article reports on a discourse analysis of 50 rules charts and identifies three disciplinary…

Frequency graph types differ in the way how data are translated into visual representations. We compared 2 visualization methods, a traditional circular representation (pie chart) and a rectangular representation (constant column width tree map), which were hypothesized to differ regarding the cognitive ease of visual comparison processes.…